

#warp{
	width: 400px;
	height: 400px;
	margin: 30px auto;
	border: 1px dotted red;
	position: relative;
}

.area{
	width: 180px;
	height: 20px;
	float: left;
	position: absolute;
	bottom: 0px;
	/*为了营造视觉错误*/
	overflow: hidden;
}

#warp .area div{
	width: 18px;
	height: 18px;
	border: 1px solid black;
	float: left;
}